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Crossover between 2 franchises
- #8024 (Batman, Miraculous Ladybug)
- 8-Bit Pony (8-Bit Theater, My Little Pony: Friendship Is Magic)
- Aberration (Worm) (Worm, Dungeons & Dragons)
- Ace Combat: The Equestrian War: A popular Ace Combat and My Little Pony: Friendship Is Magic Crossover.
- Ace of Spades (2011) (Harry Potter, Batman, The Dark Knight)
- Acceleration (Worm, A Certain Magical Index)
- Action Pack (The Spectacular Spider-Man, Naruto)
- A Different Childhood (crossover with Monsters vs. Aliens and Megamind)
- Adorable Murderbeasts (Young Justice (2010), Pokémon)
- Adventures of a Line Hopper: A series of Buffy the Vampire Slayer and Doctor Who crossover fics, many of which are multi-chapter and completed.
- Don't Be
- Starlight
- Paradox
- Blue Box Bad
- The Facksisil of Balime
- My Weapon
- Nothing
- Something
- The Seventh Segment
- Elizabeth
- Your Nature
- The Bringer of Death
- Happy Endings
- Judgment (also with Torchwood)
- A Scooby of Her Own (also with Torchwood)
- The Most Dangerous Alien You'll Ever Meet (also with Torchwood)
- 88719 (also with Torchwood)
- The Revenge of Bilis Manger (also with Torchwood)
- A Terrible Influence (also with The Sarah Jane Adventures)
- Hindsight (also with Torchwood)
- Boyfriendish
- The Years that Never Were
- Trials
- First Day (also with Torchwood)
- Till Death, Demon, or Alien Invasion Do Us Part
- Slavery and Freedom
- Cheaters (also with Torchwood)
- Replacements (also with Torchwood)
- Mr. Hart (also with Torchwood)
- Saving Gray (also with Torchwood)
- The Making of Bilis Manger (also with Torchwood)
- Confession
- Glorious
- Sunglasses
- All Must Fall
- The Totos and the Vanguard
- Green Eyed Monster (also with Torchwood)
- Butterflies
- The Chevauchéers
- The Ten Seos
- Four Five Six (also with Torchwood)
- Prisoner
- Line Hopper
- One Word
- Irkoli
- Perfect World
- Un-Minority Report
- We Must Survive
- Invasion of Hell, Part II: Dreamless
- Mirror Vision
- Redemption
- Invasion of Hell, Part IV: the Doorway
- A Single Act of Kindness
- Tartarus Gate
- Reunion
- The Olitzitz (also with Shockwave Vampires)
- Ship Time
- Pygmalion Lost
- Slay Study
- Galia-4
- Adventures of a Screwed Up Clone: A crossover between Danny Phantom and Batman.
- Aitran (My Little Pony: Friendship Is Magic, Myst (1993))
- Alien Rebellion (Assassination Classroom, Monster Buster Club)
- Amenaza (Naruto, Bleach)
- Anderson Quest: Killing Vampires and Werewolves and Leprechauns (Hellsing Ultimate Abridged, Bloodborne)
- And now, Hell... meet Tanya (The Saga of Tanya the Evil, Hellaverse)
- An Incognito Query (The DCU, Inside Job (2021))
- An Old Man’s Retirement (Bleach & Worm)
- Apple Bloom's Mansion (My Little Pony: Friendship Is Magic, Luigi's Mansion)
- Arctic Rim (Frozen, Pacific Rim)
- Ariel & Belle (The Little Mermaid (1989), Beauty and the Beast (1991)
- Artemis Fowl and the House Elf: A crossover of Artemis Fowl and Harry Potter. When Holly Short is caught in a house-elf contract, Artemis must infiltrate Hogwarts to save her.
- Avatar Luz (Avatar: The Last Airbender, The Owl House)
- Avatar: The Last Alicorn (Avatar: The Last Airbender, My Little Pony: Friendship Is Magic)
- Avatar of Victory (Avatar: The Last Airbender & Mass Effect)
- Avengers of the Ring (Marvel Cinematic Universe, Tolkien's Legendarium)
- The Awesome Spider-Dash (Spider-Man, My Little Pony: Equestria Girls)
- Back to the Frollo (The Hunchback of Notre Dame (Disney), Back to the Future)
- Balto: Future Shock (Balto, Watchers)
- The Bank Called, Your Reality Check Bounced (Fullmetal Alchemist, Ouran High School Host Club)
- Basil's American Tail (The Great Mouse Detective, An American Tail)
- Batman and Ladybug: Miraculous Knight (Miraculous Ladybug, Batman)
- Binky Pie (My Little Pony: Friendship Is Magic, Discworld)
- Black Cat: New Bounty (Bleach, Black Cat)
- The Black Games A crossover of Avatar: The Last Airbender and The Hunger Games. Once bound by ice, now bound by fire. 12 provinces. 24 tributes. 1 winner. Let the games begin.
- Blood Doesn't Make Family (Supernatural, Harry Potter)
- Bloom Fully on the Tall Wall: Homura/Togo. A Puella Magi Madoka Magica and Yuki Yuna is a Hero two-shot fanfic where Homura ends up transported to another universe.
- The Blue Dragon (Avatar: The Last Airbender & Batman: Wayne Family Adventures)
- Blue Moon (The Twilight Saga, Buffy the Vampire Slayer)
- Bodyguard of Azula (Avatar: The Last Airbender, Naruto)
- The Boys: Real Justice: Crossover between The Boys (2019) and DC Comics
- A Bridge Once Broken (The Avengers (2012), Wakfu)
- Bruised (DizzlyPuzzled) (Danny Phantom, Justice League)
- Calculated Risk: A crossover of Hawaii Five-0 and NUMB3RS.
- Allies And Enemies: Sequel to Calculated Risk.
- Call Me Kara: A crossover of Supergirl (2015) with The Flash (2014).
- Captains Crash: A crossover of My Little Pony: Friendship Is Magic and DuckTales (1987).
- Carmelita at I.M.P. (Sly Cooper x Helluva Boss)
- A Case of Phantom Peril (Columbo & Star Wars)
- Castle Crashing Canterlot (Castle Crashers, My Little Pony: Friendship Is Magic)
- A Certain Electric Deliveryman (inFAMOUS, A Certain Scientific Railgun)
- Changeling Space Program (Kerbal Space Program, My Little Pony: Friendship Is Magic)
- Chika's Bizarre Adventure (Love Live! Sunshine!!, JoJo's Bizarre Adventure)
- Children of an Elder God: A crossover of Neon Genesis Evangelion with the Cthulhu Mythos.
- Christian Grey vs. Pepper Potts (Marvel Cinematic Universe, Fifty Shades of Grey)
- Christmas Eve Murders (Tokyo Ghoul, Collateral)
- The Chronicles of the Fellowship (The Chronicles of Narnia, The Lord of the Rings Film Trilogy)
- A City Fallen (Arcane, Primeval)
- Coccinea (Kamen Rider Dragon Knight, Puella Magi Madoka Magica)
- Code: Half Demon (Code Lyoko, Inuyasha)
- Code Lyoko: EG (My Little Pony: Equestria Girls, Code Lyoko)
- Connecting the Dots (Naruto, DC Animated Universe)
- Contact at Kobol (Battlestar Galactica (2003), Stargate-verse)
- Creeping Darkness (Alan Wake, My Little Pony: Friendship Is Magic)
- Crossed Wires (Alias, Supernatural)
- Crossing Fields of Golden Wind (JoJo's Bizarre Adventure, Sword Art Online)
- The Crow: Phoenix Rising (Harry Potter, The Crow)
- CSI: Death by Chocolate (Charlie and the Chocolate Factory, CSI)
- The Cultist (Hazbin Hotel, The DCU,Cultist Simulator)
- Cute Meets Psycho (Sailor Moon, Heathers)
- Daily Equestria Life with Monster Girl (My Little Pony: Friendship Is Magic, Monster Musume)
- "Daleks Have No Concept of Friendship!" (Doctor Who, My Little Pony: Friendship Is Magic)
- Dangerous Tenant (Doctor Who, Resident Evil)
- Danny Phantom: A Trip to Tomobiki (Of Ghosts and Aliens) (Danny Phantom, Urusei Yatsura)
- Danny Phantom Vs American Dragon Jake Long: The Novelization A crossover of Danny Phantom and American Dragon: Jake Long.
- Daria in Morrowind (The Elder Scrolls III: Morrowind, Daria)
- A Dark Knight over Sin City (Batman, Sin City)
- Deadpool Syndrome (Marvel Cinematic Universe, Big Hero 6)
- A Dead World (Fallout, [PROTOTYPE])
- Dean Thomas and the Curse of Jumanji (Harry Potter, Jumanji)
- The Deconstruction of Rick (Rick and Morty, Doctor Who)
- Demented'verse (Harry Potter, Supernatural)
- Definitely not Lupus (Once Upon a Time (2011), House)
- Delirium (audriuska12) (Worm, Vampire: The Masquerade)
- Destiny: Gospel of a New Genesis (Neon Genesis Evangelion, Destiny)
- Development (The Addams Family, Beetlejuice (1988))
- Dexter's Kids (Dexter's Laboratory, Phineas and Ferb)
- Digimon Fusion Kai: A Fusion Fic between Digimon and Dragon Ball Z.
- Digital Storage Solutions (Pokémon, Digimon)
- Dimensional Gate Screwover (Disgaea, Monster Girl Encyclopedia)
- Disney Villain Island (Total Drama, Disney Animated Canon)
- Disventure Drama All Stars (Disventure Camp, Total Drama)
- Doctor in the Underworld (Doctor Who, Underworld (2003))
- Doctor Who and the Rambaldi Enigma (Doctor Who, Alias)
- A Doll's Heart (Prima Doll, Library of Ruina)
- Dost Thou Even Steal Hearts? (My Hero Academia, Persona 5)
- A Dovahkiin without Dragon Souls to spend (Worm, The Elder Scrolls V: Skyrim)
- The Dragon King's Temple: (Avatar: The Last Airbender,Stargate SG-1) crossover.
- D Reincarnation (One Piece, My Little Pony: Friendship Is Magic)
- Dueling Zero (Fate/Zero, Yu-Gi-Oh!)
- Eagle's Fall (Mass Effect, Command & Conquer: Tiberian Series)
- The Earth Bet Vermintide (Worm, Warhammer)
- Eddward Wright: Ace Attorney: Ed, Edd n Eddy, Phoenix Wright: Ace Attorney and Portal.
- Egypt on Anur Khufos: A Ben 10 fanfic with characters inspired by Mummies Alive!.
- Elemental Flux (Calvin and Hobbes, Avatar: The Last Airbender)
- Elementals of Harmony: A My Little Pony: Friendship Is Magic and Magic: The Gathering crossover focusing on MtG-style elementals of the Elements of Harmony appearing in Equestria and causing chaos, and Ditzy trying to keep a handle on things.
- Equestria’s Avengers of Justice (My Little Pony: Friendship Is Magic, Marvel Cinematic Universe)
- Equestria Girls: A Fairly Odd Friendship (My Little Pony: Equestria Girls, The Fairly OddParents!)
- An Essence of Silver and Steel (Worm, Fate/kaleid liner PRISMA☆ILLYA)
- Evidence of Shadows (Yu-Gi-Oh! & CSI)
- Fairy May Cry (Devil May Cry, Fairy Tail)
- The original Fallout: Equestria: One of the fandom's most well-known and beloved fanfics, inspiring two short print runs of hardback books of the story, and many spin-offs.
- Family Fun Summer Vacation AU (The Ghost and Molly McGee, Five Nights at Freddy's)
- Fates Collide (RWBY, Fate/Grand Order)
- Fatherhood (Platon) (Steven Universe, Epithet Erased)
- The First Saniwa (Touken Ranbu/Onmyōji (2016)): The Revisionists attempt to target Minamoto no Yorimitsu, the first person with saniwa powers in history, which will not only alter history but also directly affect the existence of touken danshi and the present saniwa. Three teams of swords are sent to the Heian period to stop them.
- Five Times Jesse Pinkman Met A Companion (Breaking Bad, Doctor Who)
- For Earth and Her Colonies (KanColle, Halo)
- Fredbear's Family Diner (Five Nights at Freddy's, Cthulhu Mythos)
- Friendly Foreign Exchange Student Spider-Man! (Marvel Cinematic Universe, My Hero Academia)
- Frozen Turtles (Frozen (2013), Teenage Mutant Ninja Turtles (2012))
- Fruit of Madness (One Piece, Genndy Tartakovsky's Primal)
- Galton's Children (Code Geass, Elfen Lied)
- A Goddess Comes to Call (Ah! My Goddess, Bubblegum Crisis)
- God of a New World (Bleach, Overlord (2012))
- The Ghost Child and the Ghostbusters (crossover Danny Phantom, and Extreme Ghostbusters)
- Ghost In The Buggy (Filmation's Ghostbusters, The Transformers)
- Golden Vines (The Owl House, Tangled)
- The Gotham City Stand User (JoJo's Bizarre Adventure & Batman)
- When Hailey met Gretel (Hailey's On It!, Hamster & Gretel)
- Hammerhand (Warhammer 40,000, Mass Effect)
- The Hancock Initiative (Hancock & The Avengers (2012))
- Harry Potter and the Berserker (Harry Potter, Berserk)
- Harry Potter and the Death Note (Harry Potter, Death Note)
- Harry Potter and the Mystic Force (Harry Potter, Power Rangers Mystic Force)
- Harry Tano: (Harry Potter and Star Wars crossover)
- Hazredous Interruptions (Lyrical Nanoha, RWBY)
- Heaven's Light: Quasimodo and Rapunzel both desired freedom from their towers. Little did they suspect how their paths would cross. Crossover between The Hunchback of Notre Dame (Disney) and Tangled.
- Seven Days in Corona: Introduces the royal family of Dunbroch from Brave, and features a cameo from a Deadly Nadder from How to Train Your Dragon (2010).
- Hellmouth High Schools Don't Have Reunions (Buffy the Vampire Slayer and Doctor Who)
- Helluva Deal (Miraculous Ladybug & Helluva Boss)
- Help from afar (Fullmetal Alchemist and Avatar: The Last Airbender)
- A Heroic Avenger (Fate/Grand Order, Is It Wrong to Try to Pick Up Girls in a Dungeon?)
- Highschool Dragon (My Little Pony: Friendship Is Magic, High School D×D)
- A Horse for the Force (Star Wars, Ranma ½)
- How to Secure and Contain the Diclonius Virus to Protect Humanity (Elfen Lied & SCP Foundation)
- Hunters And Halfas (Danny Phantom & Supernatural)
- Hybrid Hive: Eat Shard? (Worm, Magical Girl Lyrical Nanoha)
- Ice Fury (How to Train Your Dragon (2010), Frozen)
- In Another Life (2010) (Buffy the Vampire Slayer, NUMB3RS)
- In Flight (Fate/stay night and Sekirei)
- Inaccurate Legends (Fate/stay night, Monty Python and the Holy Grail)
- Incredible Robinsons: A Crossover Couple between Violet Parr (The Incredibles) and Wilbur Robinson (Meet the Robinsons).
- Indiana Jones and the Blue Archive (Indiana Jones & Blue Archive)
- Infinity Train Book SU Gem Shards (crossover Infinity Train and Steven Universe)
- Innocence and Experience: Crossover with pre-New 52 Batman and Young Justice (2010)
- Intercession (Harry Potter and Worm)
- Intergalactic No Fault Collisions (crossover between Star Wars and Worm)
- The Institute Saga: Crossover with Superman and X-Men: Evolution.
- Iron Hearts (Warhammer 40,000, My Little Pony: Friendship Is Magic)
- The Iron Man Project (Kim Possible, Iron Man (2008))
- Into The Storm (Stand Still, Stay Silent & Pacific Rim)
- Jackie Chan Adventures with TMNT (Jackie Chan Adventures, Teenage Mutant Ninja Turtles (2003))
- The Jane Doe on the Autopsy Table (The Autopsy of Jane Doe & Bones)
- Jaune Arc, Lord of Hunger: Crossover between Star Wars Legends and RWBY.
- Justice League: The Spider: Crossover with Spider-Man and DC Animated Universe.
- Kamen Rider Days (Kamen Rider Den-O, School Days)
- Kamen Rider Showa (Kamen Rider, Higurashi: When They Cry)
- A Kingdom Called Sugar Rush (Once Upon a Time (2011), Wreck-It Ralph)
- Kingdom Hearts: Cody's Story: Crossover With Kingdom Hearts and Total Drama
- Koihime†Musou: Tales of the Armored War Gods (Kamen Rider Gaim, Koihime†Musou)
- Kwami Magi Homura Magica (Miraculous Ladybug, Puella Magi Madoka Magica)
- Ladybug is Team Cap (Miraculous Ladybug, Marvel Cinematic Universe)
- Lantern Prime: Crossover with Transformers and Green Lantern.
- Last Child of Krypton: Crossover with Neon Genesis Evangelion and Superman, both the original fic and the rewrite are completed.
- The Last Connor (Aliens, Terminator Genisys)
- The Last Daughter: A crossover of Worm with Superman.
- The Leap Forward: A crossover of Quantum Leap with NUMB3RS.
- Learning from the best (whether you want to or not) (A crossover with The Incredibles and Miraculous Ladybug)
- Legacy of the Red Sun (Star Wars, Superman)
- The Legendary Shield (My Hero Academia, The Rising of the Shield Hero)
- Lethal Species (Buffy the Vampire Slayer, Alien)
- Lighting Candles (Big Hero 6, Rise of the Guardians)
- Light's Song (The Owl House, Supernatural)
- Light the Blue Touch Paper and Run Like Hell (Marvel Cinematic Universe, Fate Series)
- Like Dreamers Do (Wreck-It Ralph, Disney Animated Canon)
- Lodestar: Crossover between Worm and X-Men.
- A Long Road (Grandmaster of Demonic Cultivation: Mo Dao Zu Shi, Heralds of Valdemar)
- Lost in the Woods (Star Trek: The Next Generation, Firefly)
- Love at First Sight (Once Upon a Time) (Once Upon a Time (2011), Mr. Right)
- LOVE HINA DOUBLE TROUBLE (Kamen Rider Double, Love Hina )
- Lulu's Bizarre Rebellion (Code Geass, JoJo's Bizarre Adventure)
- Mad World: Crossover between Invader Zim and Johnny the Homicidal Maniac. Haunted by strange nightmares, Dib investigates a string of murders, which lead him right to Nny.
- Mahou Shoujo Keiongakubu Magica (K-On!, Puella Magi Madoka Magica)
- Mama Snek In BB (Fate Series & Worm)
- A Man of Focus (John Wick, Black Lagoon)
- The Man with No Name (Doctor Who, Firefly)
- Mandie's New Target (The Fairly OddParents!, Danny Phantom)
- Mario and Sonic: Heroes Unite!: A crossover of Super Mario Bros. with Sonic the Hedgehog.
- Max Payne Stumbles Into Equestria (Max Payne, My Little Pony: Friendship Is Magic)
- The Mermaid and the Genie (The Little Mermaid, Aladdin.
- Mia Fey: Ace Attorney – The Fool's Turnabout (Ace Attorney, Persona 5)
- Miraculous Escalation (Miraculous Ladybug, Worm)
- Miraculous Ladybug vs. the Forces of Evil: A crossover between Miraculous Ladybug and Star vs. the Forces of Evil.
- The Misadventures Of Cosplay Man (Danny Phantom & The DCU)
- The Misery Senshi Neo-Zero Double Blitzkrieg Debacle: A crossover of Daria, Sailor Moon
- The Miraculous Adventures of Dan Kuso (Miraculous Ladybug, Bakugan Battle Brawlers)
- The Misfits Series Crossover between X-Men: Evolution and G.I. Joe: A Real American Hero)
- Mission Possible (Kim Possible, The Adventures of Jimmy Neutron, Boy Genius)
- Monsters (Aliens, Once Upon a Time (2011))
- Monsters Versus Aliens (Lilo & Stitch, Monsters, Inc.)
- More than Meets the Eye: A crossover between Spider-Man and Transformers.
- Mortal Kombat vs. The Owl House: A crossover between Mortal Kombat and The Owl House.
- The Mountain and the Wolf (Warhammer & Game of Thrones)
- Murder by the Notebook (Columbo, Death Note)
- Mutant Storm (Harry Potter, X-Men)
- My Little Animaniacs: A crossover between My Little Pony: Friendship Is Magic and Animaniacs.
- My Little Community Friendship Is Awesome (My Little Pony: Friendship Is Magic, Community).
- My Little Corrupted Pony (My Little Pony: Friendship Is Magic, Pibby)
- My Mirror, Sword and Shield (Code Geass, Back to the Future)
- My Trans-Dimensional Overpowered Protagonist Harem Comedy Is Wrong (My Youth Romantic Comedy Is Wrong, as I Expected & Is It Wrong to Try to Pick Up Girls in a Dungeon?)
- N7 Soldier (Mass Effect, Crisis Core)
- The Necromancer (Once Upon a Time (2011), The Lord of the Rings Film Trilogy)
- A new kind of Fairy Queen (Fairy Tail, The Dresden Files)
- Not A Story The Jedi Would Tell You (Star Wars, Star Trek: Lower Decks)
- The New Recruit (Chronicle, The Avengers (2012))
- The New Teacher (Spider-Man, X-Men)
- New Stars (Star Wars: The Clone Wars and The Orville)
- New World Blues (Fallout, RWBY)
- Nightmare in Arkham A crossover between Batman and A Nightmare on Elm Street.
- No Chance for Fate: a Sailor Moon and Ranma ½ crossover
- Non Serviam (Worm, High School D×D)
- Of Gods and Men: Light/Mikami. A Harry Potter and Death Note crossover in which Mikami discovers he's a wizard and brings his God along for the ride.
- The One Exception (Cyberpunk 2077 & Cyberpunk: Edgerunners)
- Onegai, Megami-Sama! (Ah! My Goddess, Please Teacher!)
- On Missing Limbs: A crossover of Worm with Metal Gear Solid V: The Phantom Pain.
- On the Run (Smallville, The Fast and the Furious)
- The Open Door (Kingdom Hearts) (Kingdom Hearts, Silent Hill)
- Operation FOSTERS (Codename: Kids Next Door, Foster's Home for Imaginary Friends)
- Operation Genos (Mobile Suit Gundam SEED and Touhou Project)
- Pawprints In DC (Hetalia: Axis Powers, Young Justice (2010))
- A Peaceful Afterlife (Hazbin Hotel, JoJo's Bizarre Adventure: Diamond is Unbreakable)
- Helluva Job (crossover with JoJo's Bizarre Adventure: Golden Wind)
- People Like Us (Joker (2019), Taxi Driver)
- Perspective (Roving Otter) (BoJack Horseman, Rick and Morty)
- Peter Parker Needs a Hug (Spider-Man and Batman)
- Petunia Evans, Tomb Raider (Harry Potter, Tomb Raider)
- Phantom Titan (Danny Phantom, Teen Titans (2003))
- Pirates of the Ring (Pirates of the Caribbean, Tolkien's Legendarium)
- Plus Five to Charisma (Encanto, Dungeons & Dragons)
- A Pony Out of Place (My Little Pony: Friendship Is Magic, Pokémon the Series)
- Pretty Princess Powerhouses (Disney Princess, Pokémon)
- Prince Heinel Vs The Barney Bunch (Voltes V, The Barney Bunch)
- Princesses of Power and Robots in Disguise (She-Ra and the Princesses of Power and Transformers)
- Princess Maniacs (Animaniacs, Disney Princess)
- Queen of Blood (SirWill) (Castlevania, Worm)
- Realm of Entwined Science and Sorcery — Academy City (Fate/Grand Order, A Certain Magical Index)
- Recognized (Danny Phantom, Young Justice (2010))
- Resident Evil Behind The Mask (Resident Evil, Cardcaptor Sakura)
- Respect: A crossover between Smile PreCure! and Madoka Magica
- Resurgence Series (The Twilight Saga, Heroes (2006))
- Richard Castle, Watcher (Castle (2009) & Buffy the Vampire Slayer)
- Ring-Maker (The Lord of the Rings, Worm)
- Roanapur Contracts (Hitman, Black Lagoon)
- Rosario to Kiva: A crossover between Kamen Rider Kiva and Rosario + Vampire.
- A Rose's Scales: A crossover between RWBY and Inheritance Cycle.
- The Royal Protector: A crossover between Frozen and Tangled: The Series.
- Roze from Remnant: A crossover between RWBY and Kamen Rider Zi-O.
- Ryuko's Bizarre Adventure: Deadly Academia (Kill la Kill, JoJo's Bizarre Adventure)
- Scion of Sorcery (Harry Potter and Doctor Strange (2016))
- The Search for Victory (Marvel Cinematic Universe, Stargate SG-1 and Stargate Atlantis)
- SECURE CONTAIN the PRINCESS (Slay the Princess & SCP Foundation)
- See the Zone and Survive (My Little Pony: Friendship Is Magic & S.T.A.L.K.E.R.)
- se vis pacem para bellum (The Lord of the Rings: The Rings of Power and John Wick)
- Shared Secret (Phineas and Ferb, Hamster & Gretel)
- Shinobi: The RPG (Fallout, Naruto)
- Showa & Vampire (Kamen Rider, Rosario + Vampire)
- Silence Falls (Worm, Sailor Moon)
- Simon and Reimu: A crossover between Adventure Time and Touhou Project.
- The Slayer Prophecy (Batman, Buffy the Vampire Slayer)
- Something Wicked (Spring Awakening & Harry Potter)
- A Song of Ice and Fire Cut Short by Dust (RWBY, A Song of Ice and Fire)
- Sonic and The Menace of The Joker & Evil of the EggJoker (Crossover between Sonic the Hedgehog and 'The DCU)
- Son of the Warp (Warhammer 40,000, Percy Jackson and the Olympians)
- The Spectacular Spider-Man: Lost in Gotham (The Spectacular Spider-Man, Batman: Wayne Family Adventures)
- Spider, Slayer, Vampires and Avengers (Marvel Cinematic Universe, Buffyverse)
- Spider-X A crossover between Spider-Man and X-Men: Evolution
- Spiders and Magic: Rise of Spider-Mane: A crossover between Spider-Man and My Little Pony: Friendship Is Magic
- Spin to Win (JoJo's Bizarre Adventure: Steel Ball Run & Umamusume: Pretty Derby)
- Spy X Son (SPY×FAMILY and Dragon Ball Super)
- Star Wars: Force of Nature: A crossover between Star Wars Rebels and Godzilla.
- Starfall (Star vs. the Forces of Evil) A crossover between Star vs. the Forces of Evil and Gravity Falls.
- Stargate: Guardians (Sailor Moon & Stargate SG-1)
- Stars Above: A crossover between Lucky Star and Madoka Magica
- The Stepbrother Sitch: A crossover between Kim Possible and Phineas and Ferb.
- A Storm of Chaos: A Doctor Whooves Adventure (Doctor Who, My Little Pony: Friendship Is Magic)
- The Stranded Barbarian (Conan the Barbarian, Goblin Slayer)
- A Study In Magic (Harry Potter, Sherlock)
- Summer and Winter: A crossover between One Piece and Rise of the Guardians.
- Super RWBY Sisters (Super Mario Bros., RWBY)
- Superwomen of Eva 2: Lone Heir of Krypton: A crossover between Neon Genesis Evangelion and Supergirl
- Swapping Genres (Once Upon a Time (2011), Marvel Cinematic Universe)
- Tales of the Otherverse (The DCU, Marvel Universe)
- The Tangled Princess Bride: The Princess Bride and Tangled.
- Theogony (Worm, God of War)
- Thomas & Friends Equestria Girls Gold Dust and Harmony: Crossover between Thomas and the Magic Railroad and My Little Pony: Friendship Is Magic.
- Thousand Shinji: A crossover between Neon Genesis Evangelion and Warhammer 40,000.
- Through a Temple (Mass Effect, Star Trek: Deep Space Nine)
- Thrower of the Dart (Artemis Fowl, Marvel Cinematic Universe)
- Time Anomaly (Doctor Who, Marvel Cinematic Universe)
- Time Lords and Terror and Mines of Dragon Mountain: A Doctor Who / My Little Pony: Friendship Is Magic crossover fic and its sequel. There is a third installment but it seems to be abandoned.
- To rise above (Marvel Cinematic Universe, Buffyverse)
- Tok'ra Apocalypse (Supernatural, Stargate-verse)
- Total Disventure All Stars (Disventure Camp, Total Drama)
- Trapped in Toon Land (Animaniacs, Looney Tunes)
- Triumph of the Retart (Daria, Beavis and Butt-Head, King of the Hill)
- Trust Doesn't Rust (Supernatural, Jennifer's Body)
- Two earths (Marvel Cinematic Universe, Arrowverse)
- Two Worlds, One Loved One (Darkwing Duck, DuckTales (1987))
- ULTIMATE ONE: TYPE-Taylor (Nasuverse, Worm)
- Ultrasonic (Miraculous Ladybug, Zootopia)
- Uncle Quentin's Spy (Harry Potter, Buffy the Vampire Slayer)
- The Underside of Gotham (Worm and Batman)
- An Unexpected Future (My Hero Academia, The Umbrella Academy (2019))
- The Unexpected Rookie (Transformers & Cars)
- The Vampire of Steel: A crossover between Supergirl and Buffy the Vampire Slayer.
- Vanishing Act (Persona 5, JoJo's Bizarre Adventure)
- Variant Strain ([PROTOTYPE], Spider-Man)
- The Vasto of White (Bleach, Fate/stay night)
- Violence in the Library: A crossover between Star Wars and Alien.
- The Voices in my Head and a Pristine Blade (Worm & Slay the Princess)
- Wandering Pilot: A crossover between Neon Genesis Evangelion and Queen's Blade.
- A Wand for Skitter (Worm, Harry Potter)
- The Wario Barker Collection (Doctor Who, Azumanga Daioh)
- The Weaving Force (Worm & Star Wars)
- Weight of the World: A five-installment crossover between RWBY and Hetalia: Axis Powers.
- What the Cat Dragged In (Miraculous Ladybug, Marvel Cinematic Universe)
- When Life Gives You Lemons: A crossover between Worm and Portal.
- When the Doctor Went to Downton: A crossover between Doctor Who (see above) and Downton Abbey.
- Where No Pony Has Gone Before (My Little Pony: Friendship Is Magic, Star Trek: The Original Series)
- White Devil of the Moon: A crossover between Sailor Moon and Lyrical Nanoha in which the reincarnation of the Moon Princess is Nanoha Takamachi.
- A Witcher on Remnant (The Witcher, RWBY)
- Wolverines, Wendigos and Winchesters (X-Men (Film Series), crossover with Supernatural)
- Worlds Collide (TMNT) (Avatar: The Last Airbender, Teenage Mutant Ninja Turtles (2003))
- XCOM: RWBY Within (RWBY, XCOM: Enemy Unknown)
Crossover between 3 or more franchises
- Abigail and the Rats of NIMH: A crossover between Chip 'n Dale: Rescue Rangers, Once Upon a Forest, The Secret of NIMH, and The Rescuers.
- Advent Crossover Crisis (Massive Multiplayer Crossover of over 30 franchises)
- Aeon Natum Engel: A crossover between Neon Genesis Evangelion with CthulhuTech and First Encounter Assault Recon.
- Alliance of worlds: (Marvel Cinematic Universe (particularly the MCU Spider-Man Series), Doctor Who, Merlin (2008), Buffyverse, X-Men (Film Series), Teen Wolf, The Lord of the Rings Film Trilogy, Spider-Man Trilogy, The Amazing Spider-Man Series)
- Bad Alert: The Extreme (Ratchet & Clank, Kingdom Hearts, Crash Bandicoot, Spyro the Dragon)
- The Case of the Ghost Biker: Sonic and Amy team up with Mystery Inc. to solve the case of the Ghost Biker that's terrorizing Resort Town. (Crossover between Scooby-Doo and Sonic the Hedgehog, with cameos from the The DCU)
- Champions of universes: (Marvel Cinematic Universe (particularly the MCU Spider-Man Series), Arrowverse, Buffyverse, Supernatural, Charmed (1998), X-Men (Film Series), Teen Wolf, Continuum, Spider-Man Trilogy, The Amazing Spider-Man Series).
- Childhood Friends (gelefant) (The Little Mermaid, The Powerpuff Girls, Sabrina: The Animated Series)
- Collision of Universes: (Marvel Cinematic Universe (particularly the MCU Spider-Man Series), Doctor Who, Smallville, Supernatural, Compilation of Final Fantasy VII, Devil May Cry, Kingdom Hearts, Buffyverse, YuYu Hakusho, The Lord of the Rings Film Trilogy, God of War, Charmed (1998), X-Men (Film Series), Teen Wolf, Spider-Man Trilogy and The Amazing Spider-Man Series.
- Concept Road (League of Legends, Touhou Project, Puella Magi Madoka Magica, others)
- Cool Cat and the Beauty of War and Destruction (Cool Cat Saves the Kids, American Psycho, The Dictator, McDonaldland and Voltes V)
- CRISIS (Thuktun) (Massive Multiplayer Crossover)
- Crossed Paths (a Crossover between Indiana Jones, Samurai Jack and My Little Pony: Friendship Is Magic)
- Crowns of the Kingdom (Disney Animated Canon)
- The Dragon and the Bow: Young Hiccup of Berk is given an Arranged Marriage with Merida of Dunbroch. While neither is enthusiastic, learning to love each other is only the beginning of their adventures. (Crossover between How to Train Your Dragon (2010) and Brave, with references to Tangled and The Hunchback of Notre Dame (Disney).)
- When the Cold Wind is a Callin': When the Vikings of Berk are preparing for their winter festival of Snoggletog, they're not expecting the arrival of Jack Frost and Nicholas St. North. Introduces elements of Rise of the Guardians and references to Frozen (2013).
- The Legend of Gobber the Belch. Includes references to Shrek 1.
- Ducktales: Twenty Years Later (DuckTales (1987), Darkwing Duck, TaleSpin)
- Empathy (Big Hero 6, Inside Out, Home)
- Fate Fantasy (Fate/stay night, RWBY, The Legend of Zelda, The Dresden Files, Critical Role, Sword Art Online, Ghost Rider, and Assassin's Creed)
- Fate/Parallel Fantasia (Fate/stay night, Deadman Wonderland, Puella Magi Madoka Magica, Neon Genesis Evangelion, Princess Mononoke, Slayers, Fullmetal Alchemist, The Garden of Sinners, Fruits Basket)
- Fractured Infinity (Kamen Rider, Super Sentai, Genseishin Justirisers, Metal Heroes, Ultra Series, Android Kikaider, GARO, Mighty Morphin' Power Rangers and Legend Hero Samugajeon'')
- The Great Disney Adventure Saga: Crossover between the Disney Animated Canon, Pirates of the Caribbean, Monsters, Inc. and Finding Nemo.
- Hail to the King (Thuktun Flishithy): A crossover between Neon Genesis Evangelion, Godzilla that also sees Shinji become Zone Fighter.
- Has a Type (Scooby-Doo, The Weekenders, W.I.T.C.H., Mysticons, Infinity Train)
- Heroes Series: A crossover between Marvel Cinematic Universe, Tolkien's Legendarium, Arrowverse, Smallville, DC Extended Universe, Buffyverse, Doctor Who and many more.
- Infinity Train: Blossomverse (Pokémon the Series, Infinity Train)
- Infinity Train: Blossoming Trail (crossover with Pokémon the Series and Silent Hill)
- Infinity Train: Knight of the Orange Lily (same as Blossoming Trail with Yu-Gi-Oh! VRAINS)
- Infinity Train: Court of Cyclamen
- Infinity Train: Voyage of Wisteria (same as above, minus Silent Hill)
- Infinity Train: Boiling Point (The Owl House, Infinity Train, and Pokémon the Series)
- Interventions (Buffy the Vampire Slayer, Heroes (2006), minor elements of Doctor Who and Torchwood)
- Kill Them All (starts with Worm as a base and incorporates dozens of others: Silent Hill, Resident Evil, Attack on Titan, Hellsing Ultimate, The Road, Independence Day, The Avengers, Star Trek, Arrowverse, Doctor Who, The DCU New Earth, Post-Civil War Earth-616, Wizards, My Little Pony: Friendship Is Magic, and more)
- The Legendary Heroes (The Rising of the Shield Hero, Chivalry of a Failed Knight, The Irregular at Magic High School, Yashahime: Princess Half-Demon)
- Legion of the Damned: A crossover between Star Wars, Halo, Mass Effect, RWBY, Fallout, Metal Gear, and a number of others.
- The Little Pony Legend: This is actually not a single completed fic, but several. These crossovers are between The Legend of Korra, My Little Pony: Friendship Is Magic and My Little Pony: Equestria Girls, along with the occasional Shout-Out to Disney.
- Love Worth Waiting For: Mulan/Elsa. The fic is a crossover between Frozen, Mulan, and Peter Pan. After always believing she didn't have a soulmate, at age 23 Elsa learns that her nonsensical soulmark is actually Chinese calligraphy. Her soulmate is China's hero, Fa Mulan.
- A Man Like No Other series (The 100, Marvel Cinematic Universe, The Hunger Games)
- Milo Murphy's Law: The Empire Strikes Back (Star Wars, Milo Murphy's Law, Phineas and Ferb, Hamster & Gretel)
- Goggles and the Tears: A Time Travel crossover between System Shock, BioShock Infinite, Half-Life 2, and Marathon. Gordon Freeman's personality also takes from Freeman's Mind.
- The Elements of Harmony and the Savior of Worlds: A crossover between the original My Little Pony and My Little Pony: Friendship Is Magic, as well as elements of Transformers: Generation 1 and G.I. Joe.
- The Many Dates of Danny Fenton: A crossover between Danny Phantom and many different cartoons, comic books, and TV series.
- The Marvelous World of DC (Marvel Universe, The DCU Vertigo Comics, Image Comics, Dark Horse Comics, and Harry Potter)
- Mass Foundations:
- Redemption in the Stars (Mass Effect and Fallout)
- A New Day (Mass Effect)
- Little Star (Mass Effect)
- NiGHTS: Quatro Facets of Dreams (NiGHTS into Dreams…, Coraline, Spooky Month, Gravity Falls, and Undertale)
- Rising of the Shield Hero: Another Version (The Rising of the Shield Hero, Fire Emblem: Three Houses & Monster Hunter)
- Somnium: A Dark Fic crossover between Aladdin, Enchanted, Mulan, and Sleeping Beauty (1959) inspired by The Princess Series.
- Swords of Heaven (Massively Multiplayer Crossover including Code Geass, Gundam Build Fighters, Star Wars, Halo, RWBY, Persona)
- The Tooniverse Emissary: Massively Multiplayer Crossover between various cartoon and anime series; based on Super Smash Bros. Brawl's story mode, "The Subspace Emissary".
- Thunder and Steel (Crossover between Thor (2011) and Supergirl (2015), while also heavily featuring Smallville, the rest of the Arrowverse and many elements of The Avengers: Earth's Mightiest Heroes as well as The Mighty Thor)
- TMDDF: What If? (Danny Phantom, Western Animation, Anime, and Video Game franchises.)
- Twilight Storm (Doctor Who, The Twilight Saga; one fic features The Princess Series)
- Whotrek: The Ultimate Adventure 1 (Massive Multiplayer Crossover, mostly Doctor Who & Star Trek: The Original Series)